"use strict"; // directives must use single or double quotes
var foo = 1;
// `backtick` should not warn import/export sources.
import "a"; import 'b';
import a from "a"; import b from 'b';
export * from "a"; export * from 'b';

// `backtick` should not warn property/method names (not computed).
var obj = {"key0": 0, 'key1': 1};

class C { "double"; 'single'; }